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Take a string and pull it from one side of the dropout to the head tube. Measure the distance from the string to the seat tube on both side. If that dimension is the same, then the rear triangle should be straight or at least close enough that can be cold set back straight. Drop out always get out of wack so a special tool is needed to realign them. It can be make with a big nut and some threaded rod to pull then back. The hanger is almost always bent. That must be pull with a straight wheel in place and a special tool.
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